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Easy one. He turns on one switch and leaves it on, a second switch is turned on for about 10 seconds. Upon turning off the second light, he heads upstairs. One bulb is lit. One bulb is warm and the third is cold, as it is connected to the switch which was not turned on.
Note: this doesn't work well with LEDs.
Best
Les
__________________
Best
Les
My train of thought has been replaced by a bumper car.
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